mpfr: Update to version 4.1.1 with patch 1

mpfr: Update to version 4.1.1 with patch 1

- Update from version 4.1.0 with patch set 1 to 13 to 4.1.1 with aptch set 1 to 1
- Update of rootfile
- Changelog
    Changes from version 4.1.0 to version 4.1.1:
	- Bug fixes (see <https://www.mpfr.org/mpfr-4.1.0/#fixed> and/or the
	  ChangeLog file), in particular for macros implementing functions.
	- Improved manual formatting.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>